<!doctype html>
<head>
<meta charset=utf-8>
<title>Ancestor's activeElement should be cleared when child loses focus</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
</head>
<body>
<input placeholder="input in top level"/>
<iframe></iframe>
<script>
const outerIFrame = document.querySelector('iframe');
setup({ explicit_done: true });
function runTest() {
  test(() => {
    assert_equals(outerIFrame.contentDocument.activeElement, outerIFrame.contentDocument.body,
      "Initially, the activeElement of the outer iframe should be <body>");

    const innerIFrame = outerIFrame.contentDocument.createElement("iframe");

    window.onmessage = function(event) {
      if (event.data != "ready") {
        return;
      }

      // We receive an message when the innerIFrame is ready and its input is focused.
      // outerIframe is the ancestor of inner iframe, so the activeElement of
      // it should be the inner iframe.
      assert_equals(outerIFrame.contentDocument.activeElement, innerIFrame,
        "The activeElement of the outer iframe should be the inner iframe");

      // Now we focus the input in the top level
      document.querySelector("input").focus();

      // Wait for a bit to let whatever the code that might change the focus to run
      window.requestAnimationFrame(function() {
        window.requestAnimationFrame(function() {
          window.requestAnimationFrame(function() {
            // Since inner iframe lost its focus, the activeElement of outer iframe
            // should be cleared as well, hence <body> should be focused.
            assert_equals(outerIFrame.contentDocument.activeElement, outerIFrame.contentDocument.body,
              "The activeElement of the outer iframe should be reverted back to <body>");
            assert_equals(document.activeElement, document.querySelector("input"),
              "The activeElement of the top-level document should the input");
            done();
          })
        });
      });
    }

    // Opens the cross-origin inner iframe with a page that contains an input element.
    innerIFrame.src = "http://{{domains[www1]}}:{{ports[http][0]}}/focus/support/cross-origin-ancestor-activeelement-after-child-lose-focus-helper.html";
    outerIFrame.contentDocument.body.appendChild(innerIFrame);
  });
}

window.onload = function() {
  runTest();
}
</script>
</body>
